I have an electric awning on my 2016 283RKS Catalina. I can not tighten the knobs on my awning, so when it is out and it is raining one side drops allowing water to run off. I tried to removed them so I could drill a dimple in the arm to rest the knobs threaded end in to hold it, but I could not remove them. They appear to have a retaining washer on them. does anyone have a similar problem and how did you fix it.